Bugging Wifi issues of Lion, remain in Mountain Lion too.
I have another bugging issue.
I had this problem in Lion too, thought it would be fixed if I cleaned install (was lazy to do so), now cleaned install MLion after a year, still the same problem.
If I leave my laptop to sleep mode, then when I wake it up again, it will never connect to my wifi network!
A) I HAVE TO HAVE reboot my router
B) I HAVE to restart my macbook pro.
to fix this and to make it able to connect to my hotspot again. nothing else seems to fix it.
Please help. this is THE most frustating feature of my mac.
MacBook Pro (13-inch Early 2011), OS X Mountain Lion